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| /* PROLOG END TAG zYx */ |
| #ifdef __SPU__ |
| #ifndef _ATAN2D2_H_ |
| #define _ATAN2D2_H_ 1 |
| |
| #include <spu_intrinsics.h> |
| |
| #include "divd2.h" |
| #include "atand2.h" |
| |
| /* |
| * FUNCTION |
| * vector double _atan2d2(vector double y, vector double x) |
| * |
| * DESCRIPTION |
| * The atan2d2 function returns a vector containing the angles |
| * whose tangets are y/x for the corresponding elements of the |
| * input vectors. |
| * |
| * The reason this function exists is to use the signs of the |
| * arguments to determine the quadrant of the result. Consider |
| * sin(x)/cos(x) on the domain (-pi, pi]. Four quadrants are |
| * defined by the signs of sin and cos on this domain. |
| * |
| * Special Cases: |
| * - If the corresponding elements of x and y are zero, the |
| * resulting element is undefined. |
| * |
| */ |
| |
| static __inline vector double _atan2d2(vector double y, vector double x) |
| { |
| vec_uchar16 dup_even = ((vec_uchar16) { 0,1,2,3, 0,1,2,3, 8,9,10,11, 8,9,10,11 }); |
| vector double pi = spu_splats(SM_PI); |
| vector unsigned long long ones = spu_splats(0xFFFFFFFFFFFFFFFFull); |
| vector unsigned long long quad1; |
| vector unsigned long long quad4; |
| vector double result; |
| |
| vector unsigned long long xlt0; |
| vector unsigned long long yge0; |
| vector unsigned long long ylt0; |
| |
| xlt0 = (vec_ullong2)spu_rlmaska((vec_int4)spu_shuffle(x,x,dup_even), 31); |
| ylt0 = (vec_ullong2)spu_rlmaska((vec_int4)spu_shuffle(y,y,dup_even), 31); |
| yge0 = spu_xor(ylt0, ones); |
| |
| quad1 = spu_and(ylt0, xlt0); |
| quad4 = spu_and(yge0, xlt0); |
| |
| result = _atand2(_divd2(y,x)); |
| |
| result = spu_sel(result, spu_sub(result, pi), quad1); |
| result = spu_sel(result, spu_add(result, pi), quad4); |
| |
| return result; |
| } |
| |
| #endif /* _ATAN2D2_H_ */ |
| #endif /* __SPU__ */ |